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The authors regret an error in Table 3 of the above paper that gives the amount of Phosphate applied to the experiments. These are shown as kg P 2 O 5 ha− 1 for 1962–1978, but labelled as kg P ha− 1 not P 2 O 5 for 1980–1987 although the data are kg P 2 O 5 ha− 1. Below we provide a revised Table 3 with the correct data, all as kg P ha− 1. The amounts of P applied were not used in the analyses of the data, so the error had no effect on the Results, Discussion and Conclusions.